Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f0695a7735746…

MALICIOUS

PDF

72.6 KB Created: 2021-03-17 06:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d25f5c90aa83050b4e6efa73cbb8f4fa SHA-1: 35a0703be0ffcde93686313b25a3de0db1011f39 SHA-256: 687f0695a7735746e1abf5152e406cdd5394279f9d6d471bb0b4bed4c951192c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, 'https://ponafet.ru/strik?utm_term=internal+auditing+training+courses', suggests a phishing or scam attempt disguised as information about auditing training courses. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=internal+auditing+training+courses
    • http://babbieshop.ru/430176639881u78a.pdf
    • https://cdn-cms.f-static.net/uploads/4420911/normal_600d5942830e6.pdf
    • http://kugewezebuvigiw.mygamesonline.org/64230621164.pdf
    • http://extraevents.ru/90138800657sd1e4.pdf
    • https://cdn.sqhk.co/dagozuwemep/lGheQR7/daxajaxikatasel.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fdf81405f661.pdf
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fe66858c285d.pdf
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6032630f09397.pdf
    • http://zelopaqq.xyz/90431975976nhwua.pdf
    • https://cdn.sqhk.co/zejovedelali/bgsgdhd/zikategadesamo.pdf
    • http://tojuvapemupo.mywebcommunity.org/what_type_of_bugs_are_in_arizona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jozaponi/vudetuvefaweveremix.pdf
    • https://uploads.strikinglycdn.com/files/8b1152b0-33fa-4828-8ae7-4361aafbc8b4/fatapamevemixil.pdf
    • http://vulopekusape.atwebpages.com/xunowovikulufomedek.pdf
    • https://s3.amazonaws.com/julaxel/boxelerudekobowatekitud.pdf
    • https://s3.amazonaws.com/nafibanefexex/centos_vs_ubuntu_performance.pdf
    • https://uploads.strikinglycdn.com/files/9fba83c3-5732-40e5-addf-19b3bf6e4de8/attack_on_titan_game_ps4_english.pdf
    • https://uploads.strikinglycdn.com/files/62c9544b-7989-4b23-ae85-8e352a3bf5d8/t-shirt_typography_design_inspiration.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de23.bin
fd8a24c55ee882c07692f808beaeead2791d447cb70a8bae1363021e0309c3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 5044 bytes
font_01_sfnt_off0000ef54.bin
d1e0e2ac3ab580bf92949dfde4af8f58e5c69f762080b36f8614e877db24c0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 11228 bytes

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